The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2013
Filed:
Feb. 22, 2010
Thomas Garoff, Helsinki, FI;
Paivi Waldvogel, Porvoo, FI;
Kalle Kallio, Porvoo, FI;
Virginie Eriksson, Stenungsund, SE;
Aki Aittola, Vasterskog, FI;
Esa Kokko, Vantaa, FI;
Thomas Garoff, Helsinki, FI;
Paivi Waldvogel, Porvoo, FI;
Kalle Kallio, Porvoo, FI;
Virginie Eriksson, Stenungsund, SE;
Aki Aittola, Vasterskog, FI;
Esa Kokko, Vantaa, FI;
Borealis AG, Vienna, AT;
Abstract
A process is disclosed for producing a multi-modal linear low density polyethylene in at least two staged reactors connected in series, comprising (i) polymerizing in a first slurry phase stage ethylene monomers with a Ziegler-Natta polymerization catalyst system to obtain a first polyethylene fraction component (A); and (ii) polymerizing in a second gas or slurry phase stage ethylene monomers with a Ziegler-Natta polymerization catalyst system to obtain a second polyethylene fraction component (B). The Ziegler-Natta polymerization catalyst system comprises: 1) a solid procatalyst formed by contacting at least: a) a Mg-alcoholate complex of formula (I) b) an aluminum compound of formula (II); and c) a vanadium compound and a titanium compound having a molar ratio (V:Ti) from 10:90 to 90:10; and 2) one or more organometallic cocatalvsts of formula (III). The linear low density polyethylene shows an improved comonomer composition distribution Formulas (I), (II), and (III) are described herein.